Apparently, it is the older systems most at risk to the March 11 DST change over. If you have Windows Vista, XP, 2003, or Mac OS X, you can rest knowing that the DST Transition will be fairly smooth.

Daylight Saving Time in the U.S. will now begin the second Sunday of March and end the first Sunday of November, extending the duration of DST by four weeks each year, in compliance with the Energy Policy Act of 2005. Experts warn I.T. administrators as well as SMBs not to wait until the last minute to determine if patches are needed. Via NewsFactor

Earlier systems such as Windows 2000, which still has a fairly large installed base are most at risk because Microsoft has not released a fix. Biggest concerns will be relating to databases and accessing networks, find out more at Are your systems ready for March 11th?

Perhaps now is the time to consider upgrading to a more modern operating system?